Image doesn't show anything if only one value exists

[ahuang11]

Nothing shows, but data is there:

import holoviews as hv
hv.Image(np.array([[np.nan, np.nan, np.nan], [1, 1, 1], [np.nan, np.nan, np.nan]]))

See some black

hv.Image(np.array([[np.nan, np.nan, np.nan], [1, 2, 1], [np.nan, np.nan, np.nan]])).options(tools=['hover'])

Workaround:

hv.Image(np.array([[np.nan, np.nan, np.nan], [1, 1, 1], [np.nan, np.nan, np.nan]])).options(tools=['hover'], cmap=['black'])

I think it's because the first color is white, and nan is also white?

[philippjfr]

@jbednar This is one problem with the fire colormap as the default.

[jbednar]

Right. There are lots of other issues with that, including that fire assumes a black background and the default for most situations is a white page, and that fire has the same issue on a black background (as it includes full black). I think we already have an issue discussing all those problems, but I don't think we ever came to an agreement about any better approach.

[github-actions]

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